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Clean Technologies and Environmental Policy

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03-01-2020 | Original Paper

Impacts of slurry and dry forms of low-rank coal (lignite) on quality of syngas produced

Authors: Imran Nazir Unar, Ghulamullah Maitlo, Suhail Ahmed Soomro, Shaheen Aziz, Syed Abdul Karim Shah, Rasool Bux Mahar, Zulfiqar Ali Bhatti, Mohammad Safar Korai

Published in: Clean Technologies and Environmental Policy | Issue 3/2020

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Abstract

Gasification is one of the prominent and technically efficient technologies for converting solids like coal, biomass or solid waste into useful gas known as “syngas.” Several configurations are in use today among which entrained flow gasifiers have several advantages over other configurations. Presently research is more focused on micro-level modifications in the configurations which have a significant impact on overall performance of gasification. Scant, literature is available for comparison of slurry over dry form of feedstocks, especially with low-grade coals. Hence, present research aims to establish a concrete finding regarding the impacts of slurry versus the dry condition of coal on the overall performance of gasification. To achieve this goal, a two-dimensional computational fluid dynamic (CFD) model of downdraft gasifier was developed in commercial CFD software FLUENT for performing numerical simulations with indigenous coal feedstock. Rich oxidant conditions (95% oxygen and 5% nitrogen) were maintained in the gasifier for the gasification. The performance of gasification was measured by comparing efficiencies of gasification and the quality of syngas produced with different coal forms. As per simulation results, coal forms and operating conditions caused a significant effect on overall gasification performance. In syngas composition, H₂ mol fraction reached at maximum, when the slurry form of coal was used for gasification. This effect is remarkable for generating hydrogen-rich fuel from lignite without consuming steam externally.

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Title: Impacts of slurry and dry forms of low-rank coal (lignite) on quality of syngas produced
Authors: Imran Nazir Unar
Ghulamullah Maitlo
Suhail Ahmed Soomro
Shaheen Aziz
Syed Abdul Karim Shah
Rasool Bux Mahar
Zulfiqar Ali Bhatti
Mohammad Safar Korai
Publication date: 03-01-2020
Publisher: Springer Berlin Heidelberg
Published in: Clean Technologies and Environmental Policy / Issue 3/2020
Print ISSN: 1618-954X
Electronic ISSN: 1618-9558
DOI: https://doi.org/10.1007/s10098-019-01804-y

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